<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, viewport-fit=cover">
    <title>填空题</title>


    <style>

        .box{
            height: 100px;
            margin-bottom: 50px;
            color: #C4191F;
        }

        input{
            border: 0px;
            border-bottom: 1px solid;
            outline: none;
            text-align: center;
            width: 50px;
        }

    </style>

</head>

<body>

    <div class="box">
        this is a good <input /> <input /> book.

    </div>

</div>
</body>

</html>
